The person who can make an amazing, open source search engine (like the Google Appliance) that can take in Exchange Servers, File Shares, and any other data source and turn around and be able to do full text search on the data would become very rich- or very well liked.

Some of the examples here show that even in the government, information is not really centrally cataloged or searchable. One hand doesn't know about the other. Maybe some of it is malice, but I have to think part of it is just not having the ability to search Email, File Shares, Sharepoint, et cetera quickly and easily.